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11#ifndef _ASM_MICROBLAZE_PGALLOC_H
12#define _ASM_MICROBLAZE_PGALLOC_H
13
14#ifdef CONFIG_MMU
15
16#include <linux/kernel.h>
17#include <linux/highmem.h>
18#include <asm/setup.h>
19#include <asm/io.h>
20#include <asm/page.h>
21#include <asm/cache.h>
22#include <asm/pgtable.h>
23
24#define PGDIR_ORDER 0
25
26
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30
31
32extern struct pgtable_cache_struct {
33 unsigned long *pgd_cache;
34 unsigned long *pte_cache;
35 unsigned long pgtable_cache_sz;
36} quicklists;
37
38#define pgd_quicklist (quicklists.pgd_cache)
39#define pmd_quicklist ((unsigned long *)0)
40#define pte_quicklist (quicklists.pte_cache)
41#define pgtable_cache_size (quicklists.pgtable_cache_sz)
42
43extern unsigned long *zero_cache;
44extern atomic_t zero_sz;
45extern atomic_t zeropage_hits;
46extern atomic_t zeropage_calls;
47extern atomic_t zerototal;
48
49#define zero_quicklist (zero_cache)
50#define zero_cache_sz (zero_sz)
51#define zero_cache_calls (zeropage_calls)
52#define zero_cache_hits (zeropage_hits)
53#define zero_cache_total (zerototal)
54
55
56
57
58
59extern unsigned long get_zero_page_fast(void);
60
61extern void __bad_pte(pmd_t *pmd);
62
63extern inline pgd_t *get_pgd_slow(void)
64{
65 pgd_t *ret;
66
67 ret = (pgd_t *)__get_free_pages(GFP_KERNEL, PGDIR_ORDER);
68 if (ret != NULL)
69 clear_page(ret);
70 return ret;
71}
72
73extern inline pgd_t *get_pgd_fast(void)
74{
75 unsigned long *ret;
76
77 ret = pgd_quicklist;
78 if (ret != NULL) {
79 pgd_quicklist = (unsigned long *)(*ret);
80 ret[0] = 0;
81 pgtable_cache_size--;
82 } else
83 ret = (unsigned long *)get_pgd_slow();
84 return (pgd_t *)ret;
85}
86
87extern inline void free_pgd_fast(pgd_t *pgd)
88{
89 *(unsigned long **)pgd = pgd_quicklist;
90 pgd_quicklist = (unsigned long *) pgd;
91 pgtable_cache_size++;
92}
93
94extern inline void free_pgd_slow(pgd_t *pgd)
95{
96 free_page((unsigned long)pgd);
97}
98
99#define pgd_free(mm, pgd) free_pgd_fast(pgd)
100#define pgd_alloc(mm) get_pgd_fast()
101
102#define pmd_pgtable(pmd) pmd_page(pmd)
103
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105
106
107
108#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
109#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
110
111extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
112
113static inline struct page *pte_alloc_one(struct mm_struct *mm,
114 unsigned long address)
115{
116 struct page *ptepage;
117
118#ifdef CONFIG_HIGHPTE
119 int flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT;
120#else
121 int flags = GFP_KERNEL | __GFP_REPEAT;
122#endif
123
124 ptepage = alloc_pages(flags, 0);
125 if (!ptepage)
126 return NULL;
127 clear_highpage(ptepage);
128 if (!pgtable_page_ctor(ptepage)) {
129 __free_page(ptepage);
130 return NULL;
131 }
132 return ptepage;
133}
134
135static inline pte_t *pte_alloc_one_fast(struct mm_struct *mm,
136 unsigned long address)
137{
138 unsigned long *ret;
139
140 ret = pte_quicklist;
141 if (ret != NULL) {
142 pte_quicklist = (unsigned long *)(*ret);
143 ret[0] = 0;
144 pgtable_cache_size--;
145 }
146 return (pte_t *)ret;
147}
148
149extern inline void pte_free_fast(pte_t *pte)
150{
151 *(unsigned long **)pte = pte_quicklist;
152 pte_quicklist = (unsigned long *) pte;
153 pgtable_cache_size++;
154}
155
156extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
157{
158 free_page((unsigned long)pte);
159}
160
161extern inline void pte_free_slow(struct page *ptepage)
162{
163 __free_page(ptepage);
164}
165
166static inline void pte_free(struct mm_struct *mm, struct page *ptepage)
167{
168 pgtable_page_dtor(ptepage);
169 __free_page(ptepage);
170}
171
172#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, (pte))
173
174#define pmd_populate(mm, pmd, pte) \
175 (pmd_val(*(pmd)) = (unsigned long)page_address(pte))
176
177#define pmd_populate_kernel(mm, pmd, pte) \
178 (pmd_val(*(pmd)) = (unsigned long) (pte))
179
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182
183
184#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
185#define pmd_free(mm, x) do { } while (0)
186#define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x)
187#define pgd_populate(mm, pmd, pte) BUG()
188
189extern int do_check_pgt_cache(int, int);
190
191#endif
192
193#define check_pgt_cache() do { } while (0)
194
195#endif
196